Synthetic resin extruding means

Abstract

This invention is concerned with an improved construction of synthetic resin extruding means provided with a single unit having a kneading power which is strong enough to mix or knead a resin strengthening admixture material with a raw resin material and being able also to extrude nothing but resin from the extruding means as in the case with the conventional type extruding means. The invention further involves a construction of extruding means provided with a particular mouth formed on a kneading portion of the means so that the resin strengthening admixture material can be put into the extruding means.

What is claimed is: 
     
       1. In a synthetic resin extruding apparatus, the improvement comprising: an elongated cylindrical screw shaft comprising a screw shaped grooved surface on the outer periphery thereof;   a cylindrical heater coaxially surrounding said screw shaft;   a feed mouth disposed at one end of said screw shaft for feeding a first raw material for kneading by said screw shaft; and   an exit mouth disposed at another end of said screw shaft for exiting of said material after kneading by said screw shaft;   said screw shaft comprising at least two segments, a first segment having said grooves, and a second segment having said grooves with teeth on walls forming said grooves;   a lower block disposed about substantially a lower part of said second segment;   an upper block movably connected to said lower block so that in a closed position said upper and lower blocks surround said second segment of said screw shaft, and having an open position in which said upper and lower blocks are partially disconnected from each other to permit access thereto and thereby to enable manual replacement of auxiliary kneading shafts;   said upper and lower blocks each comprising a corresponding first elongated cylindrical hollow portion for fitting about said screw shaft, a corresponding second elongated cylindrical hollow portion of a smaller diameter than said first hollow portion and disposed parallel to said first hollow portion, for holding a manually replaceable auxiliary kneading shaft, and a corresponding third elongated cylindrical hollow portion of a smaller diameter than said first hollow portion and disposed parallel to said first hollow portion, for holding a manually replaceable auxiliary kneading shaft, and feed means having access to said first hollow portion for feeding a second raw material for working by said screw shaft operable in conjunction with said first and second auxiliary shafts; said first and second replaceable auxiliary kneading shafts having screw shaped groove surfaces on the periphery thereof with teeth on the walls defining the grooves, said teeth being engagable with said teeth on said screw shaft.   
     
     
       2. In a synthetic resin extruding apparatus, the improvement comprising: an elongated cylindrical screw shaft comprising a screw shaped grooved surface on the outer periphery thereof;   a cylindrical heater coaxially surrounding said screw shaft;   a feed mouth disposed at one end of said screw shaft for feeding a first raw material for kneading by said screw shaft; and   an exit mouth disposed at another end of said screw shaft for exiting of said material after kneading by said screw shaft;   said screw shaft comprising at least two segments, a first segment having said grooves, and a second segment having said grooves with teeth on walls forming said grooves;   a lower block disposed about substantially a lower part of said second segment;   an upper block movably connected to said lower block so that in a closed position said upper and lower blocks surround said second segment of said screw shaft, and having an open position in which said upper and lower blocks are partially disconnected from each other to permit access thereto and thereby to enable manual replacement of auxiliary kneading shafts;   said upper and lower blocks each comprising a corresponding first elongated cylindrical hollow portion for fitting about said screw shaft, a corresponding second elongated cylindrical hollow portion of a smaller diameter than said first hollow portion and disposed parallel to said first hollow portion, for holding a manually replaceable auxiliary kneading shaft, and a corresponding third elongated cylindrical hollow portion of a smaller diameter than said first hollow portion and disposed parallel to said first hollow portion, for holding a manually replaceable auxiliary kneading shaft, and feed means having access to said first hollow portion for feeding a second raw material for working by said screw shaft operable in conjunction with said first and second auxiliary shafts; said first and second replaceable auxiliary shafts having substantially the same diameter as said second or third hollow portion with an arc shaped channel part extending axially along the surface thereof and shaped to coincide with said first hollow portion.